Leviticus 23

1 And the Lord spoke to Moses, saying, 2 “Speak to the children of Israel, and say to them: ‘The feasts of the Lord, which you shall proclaim to be holy convocations, these are My feasts.
3 ‘Six days shall work be done, but the seventh day is a Sabbath of solemn rest, a holy convocation. You shall do no work on it; it is the Sabbath of the Lord in all your dwellings.
4 ‘These are the feasts of the Lord, holy convocations which you shall proclaim at their appointed times. 5 On the fourteenth day of the first month at twilight is the Lord’s Passover. 6 And on the fifteenth day of the same month is the Feast of Unleavened Bread to the Lord; seven days you must eat unleavened bread. 7 On the first day you shall have a holy convocation; you shall do no customary work on it. 8 But you shall offer an offering made by fire to the Lord for seven days. The seventh day shall be a holy convocation; you shall do no customary work on it.’” ...
— LEVITICUS 23